DBMS Interview Questions and Answers in 2025 (100+ Q&A)

DBMS

Ques:- What is the difference between html and oracle?

Asked In :-

Right Answer:
HTML (HyperText Markup Language) is a markup language used for creating and structuring content on the web, while Oracle is a relational database management system (RDBMS) used for storing, retrieving, and managing data in databases.

C DBMS Software Developer/ Programmer SQL Server

Ques:- What is your nick name?

Asked In :- Winsoft Technologies India Pvt. Ltd, Valued Epistemics, Innominds Software (P), Samyak Infotech, Blackcoffer, LPG, Shaligram InfoTech Inc, Health Prime Services (India), Ritwik Software Technologies, Saama Technologies Inc,

Right Answer:
My nickname is [Your Nickname].

C DBMS JAVA Software Engineer

Ques:- Tell me about your project, searching and sorting algorithms?

Asked In :- getinsured,

Right Answer:
In my project, I implemented various searching and sorting algorithms to optimize data handling. For sorting, I used Quick Sort and Merge Sort due to their efficiency with large datasets. Quick Sort has an average time complexity of O(n log n) and is generally faster in practice, while Merge Sort is stable and works well for linked lists. For searching, I implemented Binary Search for sorted arrays, which has a time complexity of O(log n), making it much faster than linear search (O(n)). These algorithms improved the performance of data retrieval and organization in my application.

C DBMS MIS Networking

Ques:- What is Business Communication?

Asked In :- AAJ Enterprises, microchip technology, international medical corps, bessemer venture partners, terminalfour, prescient technologies, crestron electronics,

Right Answer:
Business communication is the process of sharing information between individuals or groups within an organization, as well as with external stakeholders, to achieve business goals and facilitate effective operations.

DBMS MySQL Software Developer/ Programmer

Ques:- What is mysql?

Asked In :-

Right Answer:
MySQL is an open-source relational database management system (RDBMS) that uses Structured Query Language (SQL) for managing and manipulating data stored in databases.

DBMS

Ques:- What is the foreign key?

Asked In :- betsol,

Right Answer:
A foreign key is a column or a set of columns in a database table that establishes a link between data in two tables. It refers to the primary key in another table, ensuring referential integrity by enforcing that the value in the foreign key column matches an existing value in the referenced primary key column.

DBMS

Ques:- When the fan trap may exist in ER model.

Asked In :-

Right Answer:
A fan trap may exist in an ER model when a single entity is associated with multiple entities, and one of those entities is also associated with another entity, leading to ambiguity in relationships and potential data integrity issues.

DBMS

Ques:- What is the minimum cardinality of zero specifies?

Asked In :-

Right Answer:
The minimum cardinality of zero specifies that a relationship can exist without any instances of the entity on one side of the relationship.

DBMS

Ques:- What is view level or external level data hiding?

Asked In :-

Right Answer:
View level or external level data hiding refers to the ability to restrict access to certain data in a database by providing users with a specific view of the data. This means that users can only see and interact with a subset of the data that is relevant to them, while the underlying data structure and other sensitive information remain hidden.

DBMS

Ques:- What are the drawbacks of the file system which is overcome on the database management system?

Asked In :-

Right Answer:
1. Data Redundancy: Databases reduce data duplication, while file systems often have multiple copies of the same data.
2. Data Integrity: Databases enforce rules to maintain data accuracy and consistency, whereas file systems lack such mechanisms.
3. Data Security: Databases provide user access controls and security features, while file systems have limited security options.
4. Data Access: Databases allow complex queries and efficient data retrieval, while file systems require manual searching and are less efficient.
5. Concurrent Access: Databases support multiple users accessing data simultaneously, while file systems can lead to conflicts and data corruption.
6. Backup and Recovery: Databases offer built-in backup and recovery options, while file systems require manual processes.

DBMS

Ques:- What are various types of locking techniques?

Asked In :-

Right Answer:
The various types of locking techniques are:

1. **Binary Locking**: A simple lock that can be either locked or unlocked.
2. **Shared Lock**: Allows multiple transactions to read a resource but not modify it.
3. **Exclusive Lock**: Allows a single transaction to read and modify a resource, preventing others from accessing it.
4. **Read Lock**: Similar to a shared lock, it allows multiple transactions to read but not write.
5. **Write Lock**: Similar to an exclusive lock, it prevents other transactions from reading or writing.
6. **Optimistic Locking**: Assumes that conflicts are rare and checks for conflicts before committing.
7. **Pessimistic Locking**: Assumes that conflicts are likely and locks resources before accessing them.

DBMS

Ques:- What is lock?

Asked In :-

Right Answer:
A lock is a mechanism used in a database management system to control access to data, ensuring that only one transaction can modify a piece of data at a time to maintain data integrity and consistency.

DBMS

Ques:- What are the various methods of controlling concurrency ?

Asked In :-

Right Answer:
The various methods of controlling concurrency are:

1. **Locking**: Using locks (exclusive and shared) to prevent multiple transactions from accessing the same data simultaneously.
2. **Timestamp Ordering**: Assigning a timestamp to each transaction and using it to determine the order of execution.
3. **Optimistic Concurrency Control**: Allowing transactions to execute without restrictions and checking for conflicts before committing.
4. **Pessimistic Concurrency Control**: Assuming conflicts will occur and locking resources before accessing them.
5. **Multi-Version Concurrency Control (MVCC)**: Keeping multiple versions of data to allow transactions to read without waiting for locks.

DBMS

Ques:- What is result equivalent?

Asked In :-

Right Answer:
Result equivalent refers to two database queries that produce the same result set, meaning they return the same rows and columns, even if the queries are written differently.

DBMS

Ques:- What are conflict serializable schedules?

Asked In :-

Right Answer:
Conflict serializable schedules are schedules of transactions that can be transformed into a serial schedule (where transactions are executed one after another without overlapping) by swapping non-conflicting operations. Two operations conflict if they belong to different transactions, access the same data item, and at least one of them is a write operation.

DBMS

Ques:- What is the use of SAVEPOINT command?

Asked In :-

Right Answer:
The SAVEPOINT command is used to set a point within a transaction that you can roll back to, allowing partial undo of the transaction without affecting the entire transaction.

DBMS

Ques:- What is the use of COMMIT command?

Asked In :-

Right Answer:
The COMMIT command is used to save all the changes made during the current transaction to the database permanently.

DBMS

Ques:- What is the difference between DROP and TRUNCATE query?

Asked In :-

Right Answer:
DROP removes the entire table and its structure from the database, while TRUNCATE removes all rows from a table but keeps the table structure intact for future use.

DBMS

Ques:- What is the difference between DELETE and TRUNCATE query?

Asked In :-

Right Answer:
DELETE removes specific rows from a table based on a condition and can be rolled back, while TRUNCATE removes all rows from a table without conditions and cannot be rolled back. TRUNCATE is generally faster and uses fewer system resources.

DBMS

Ques:- What is TCL in RDBMS?

Asked In :-

Right Answer:
TCL stands for Transaction Control Language in RDBMS. It includes commands like COMMIT, ROLLBACK, and SAVEPOINT, which are used to manage transactions in a database.

The DBMS (Database Management System) category on takluu.com is designed for students, IT professionals, and job seekers eager to master the fundamentals and advanced concepts of databases. In today’s data-driven world, understanding how databases work is critical for roles in software development, data analysis, and system administration.

This category covers core topics such as database models (relational, hierarchical, network), SQL queries, normalization, transactions, indexing, and database security. You’ll also learn about practical aspects like database design, backup and recovery, and performance optimization.

Interview questions often test your knowledge of how to efficiently manage large volumes of data, ensure data integrity, and implement secure database solutions. Knowing DBMS concepts helps you handle real-world challenges related to data storage and retrieval effectively.

At Takluu, we simplify complex DBMS topics with clear explanations, practical examples, and common interview questions. Whether you’re preparing for technical interviews or exams, this category equips you with the skills to confidently answer questions and solve problems related to databases.

Mastering DBMS opens doors to exciting career opportunities in software development, database administration, and data science. With our resources, you’ll be well-prepared to succeed and excel in the data-centric tech industry.

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